Effect of Slag and Natural Pozzolan on the Mechanical Behavior of Recycled Glass Mortars

Abstract

The incorporation of mineral additions in cementitious materials produces a granular effect, a physico-chemical, a micro-structural effect and a chemical effect. To study the effect of mineral additions on the mechanical properties of recycled glass mortars, we propose to use a specific methodology based on the progressive substitution of cement volume (10, 20, 30%) by mineral admixtures whose absolute volume of solid phases and workability are kept constant. The aggregate used to make mortar mixtures is recycled sand resulting from the grinding of glazings known by their reactivity with respect to the alkali-silica reaction. The mineral admixtures used are different by their mineralogical nature, chemical composition and granularity, for this study we considered two mineral admixtures (granulated blast furnace slag and Beni-Saf’s natural pozzolan). After 28 days curing time, the Zwick/Roe II Z020 universal machine was used for bending and compressive strength tests. At the end of each test and data collection the stress-strain curves were obtained, from which strengths, strains and energy were determined and the elasticity modules deduced, which were compared with reference values without mineral admixtures. The different results show that the incorporation of granulated blast furnace slag and Beni-Saf’s natural pozzolan into fragile recycled glass mortars improves their mechanical behavior and ductility.